val pow : int -> int -> int

val powmod : int -> int -> int -> int

val int_and : int -> int -> int
val int_or : int -> int -> int
val int_eq : int -> int -> int
val int_less : int -> int -> int
val int_less_eq : int -> int -> int
val int_more : int -> int -> int
val int_more_eq : int -> int -> int
val int_not : int -> int

val fromIntToString : string -> int -> string